Experimental test of the interlayer pairing models for high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">T</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductivity using grazing-incidence infrared reflectometry

Schützmann, J.; Somal, H. S.; Tsvetkov, A. Yu.; Vandermarel, D; Koops, Gej; Koleshnikov, N.; Ren, Z.F.; Jh, Wang; Brück, E.; Menovsky, A.A.

doi:10.1103/physrevb.55.11118

Cited by 50 publications

(30 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fact that the ∆ 0 of IP is nevertheless very large means that the "original"∆ 0 of IP was even larger, or that the proximity effect did not reduce the ∆ 0 of IP through a mechanism proposed by Okamoto and Maier [27]: According to their calculation, the combination of overdoped and underdoped CuO 2 planes can enhance the SC order parameter of the overdoped planes while the SC order parameter of the underdoped plane remains unchanged. It may also be possible that the interlayer tunneling of Cooper pairs within the tri-layer [3] enhances the SC order parameter of the tri-layer system, although interlayer Cooper pair tunneling observed by optical conductivity measurement is known to have negligible effect on T c [34]. Further experimental and theoretical studies are necessary to clarify these possibilities.…”

Section: Pacs Numbers: Valid Pacs Appear Herementioning

confidence: 99%

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

We have investigated the optimally doped tri-layer cuprate Bi2Sr2Ca2Cu3O 10+δ (Bi2223) by angleresolved photoemission spectroscopy, and observed energy bands and Fermi surfaces originated from the outer and inner CuO2 planes (OP and IP) separately. The OP band is overdoped (hole density ∼ 0.26/Cu) with a large d-wave gap of ∆0 ∼ 43 meV while the IP is underdoped (∼ 0.06/Cu) with an even large gap of ∆0 ∼ 60 meV. We propose that the enhancement of the ∆0 of IP is due to the minimal influence of out-of-plane disorder and that the OP gap is then enhanced through interlayer coupling, most likely a proximity effect from the IP. PACS numbers: Valid PACS appear hereIt has been well known that one of the most efficient ways to increase the critical temperature (T c ) of high-T c cuprate superconductors (HTSCs) is to increase the number of neighboring CuO 2 planes (n). T c generally increases from single-layer (n = 1), double-layer (n = 2), to tri-layer (n = 3) and then decreases for n ≥ 4 [1]. So far, several mechanisms have been proposed to explain the n dependence of T c . According to the tunneling mechanism of Cooper pairs between the CuO 2 planes, T c,max should increase with increasing n [2]. However if one takes into account the charge imbalance between the planes and the existence of competing order, T c,max takes a maximum at n = 3 [3] in agreement with experiment. Meanwhile, T c shows tendency to increase with next-nearest-neighbor Cu-Cu hopping parameter t ′ , which increases with the number of CuO 2 planes [4]. Also, T c increases with decreasing degree of out-of-plane disorder [5,6]. So far, which governs the n dependence of T c,max has been unclear because of the lack of detailed knowledge about the electronic structure of the multi-layer cuprates.In the case of Bi-based HTSCs, the optimum T c (T c,max ) increases from the single-layer Bi 2 Sr 2 CuO 6+δ (Bi2201, T c,max = 35 K), the double-layer Bi 2 Sr 2 CaCu 2 O 8+δ (Bi2212, T c,max = 95 K) to the tri-layer Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi2223, T c,max = 110 K). Angle-resolved photoemission spectroscopy (ARPES) studies of double-layer Bi2212 [7,8] and four-layer Ba 2 Ca 3 Cu 4 O 8 F 2 (F0234) [10] have revealed the splitting of band dispersions and Fermi surfaces (FSs). In Bi2212, hybridization between the two CuO 2 planes causes splitting into the bonding and anti-bonding bands [7]. The ARPES study on F0234 has indicated band splitting due to the different hole concentrations of the outer CuO 2 planes and the inner CuO 2 planes, and correspondingly two FS sheets have been observed [10].The maximum superconducting (SC) gap was ∼ 60 meV, approximately twice as large as that of the smaller one. On the other hand, previous ARPES results on the tri-layer Bi2223 have not revealed band splitting and multiple FSs [11,12,13]. In the present work, we have successfully observed the band splitting of Bi2223 through a detailed photon-energy dependent study and indicated that the outer CuO 2 plane (OP) and the inner CuO 2 plane (IP) have different doping levels and gap...

show abstract

Section: Pacs Numbers: Valid Pacs Appear Herementioning

confidence: 99%

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

show abstract

“…On the one hand the essential common physics seems to lie in the collective behavior of holes doped into a 2D Mott insulator, while the interplane conductivity strongly depends on the interlayer chemistry, which varies dramatically among different members of the high-T c family. On the other hand, it is the in-plane 'confinement' that preserves a possibility of significant lowering of the c-axis kinetic energy (KE) as the 3D coherent movement of the Cooper pairs is restored below T c [1,2], which, however, was shown to be a small effect in some single-layer compounds [3,4]. The models based on the KE lowering in the superconducting (SC) state predict the violation of the Ferrell-Glover-Tinkham (FGT) optical sum rule [5], which means that the spectral weight (SW) of the SC condensate is collected not only from energies of the order of 2∆ but also from higher frequencies.…”

mentioning

confidence: 99%

c-Axis Optical Sum Rule and a Possible New Collective Mode inLa2−xS
Kuzmenko
¹
,
Tombros
²
,
Molegraaf
³

et al. 2003
Phys. Rev. Lett.
Self Cite
27
3
20
0
View full text Add to dashboard Cite

We present the c-axis optical conductivity σ1c(ω, T ) of underdoped (x = 0.12) and optimally doped (x = 0.15) La2−xSrxCuO4 from 4 meV to 1.8 eV obtained by a combination of reflectivity and transmission spectra. In addition to the opening of the superconducting gap, we observe an increase of conductivity above the gap up to 270 meV with a maximal effect at about 120 meV. This may indicate a new collective mode at a surprisingly large energy scale. The Ferrell-Glover-Tinkham sum rule is violated for both doping levels. Although the relative value of the violation is much larger for the underdoped sample, the absolute increase of the low-frequency spectral weight, including that of the condensate, is higher in the optimally doped regime. Our results resemble in many respects the observations in YBa2Cu3O 7−δ .PACS numbers: 74.25. Gz, 78.20.Ci The charge transport between the CuO 2 planes in the high-T c cuprates forms one of the most intriguing puzzles of these materials. On the one hand the essential common physics seems to lie in the collective behavior of holes doped into a 2D Mott insulator, while the interplane conductivity strongly depends on the interlayer chemistry, which varies dramatically among different members of the high-T c family. On the other hand, it is the in-plane 'confinement' that preserves a possibility of significant lowering of the c-axis kinetic energy (KE) as the 3D coherent movement of the Cooper pairs is restored below T c [1,2], which, however, was shown to be a small effect in some single-layer compounds [3,4]. The models based on the KE lowering in the superconducting (SC) state predict the violation of the Ferrell-Glover-Tinkham (FGT) optical sum rule [5], which means that the spectral weight (SW) of the SC condensate is collected not only from energies of the order of 2∆ but also from higher frequencies. For the c-axis the violation has been experimentally tested in YBa 2 Cu 3 O 7−δ (YBCO) over a broad doping range and a significant increase of the relative violation value was found in the underdoped regime [6]. In the case of La 2−x Sr x CuO 4 (LSCO) a value of 50% has been reported for a slightly underdoped sample [7], although the doping dependence is still not known. Thus, the c-axis KE lowers in the SC state, which, however, leaves room for debate whether this is a by-product or the very reason for superconductivity [1,2,8,9].

show abstract

“…Most experiments on c-axis dynamics [9,10] were carried out using ceramic NCCO samples. Alternatively, the method of grazing-incidence reflection is known to be powerful in extracting the c-axis properties of strongly anisotropic superconductors [11]. The experiments using instead of the grazing reflection a tilted sample [12] and the normal-incidence geometry may be considered as modification of this method.…”

mentioning

confidence: 99%

Submillimeter spectroscopy of tilted Nd1.85Ce0.15CuO4−δ films: Observation of a mixed ac-plane excitation

Pimenov

Пронин

Loidl

et al. 2000

Applied Physics Letters

View full text Add to dashboard Cite

The anisotropic conductivity of a series of tilted Nd1.85Ce0.15CuO 4−δ thin films was measured by quasioptical spectroscopy in the frequency range 3 cm −1 < ν < 40 cm −1 . Two characteristic features have been observed in the low-temperature transmission spectra. The first one at ν = 12 cm −1 was shown to reflect the c-axis plasma frequency of Nd1.85Ce0.15CuO 4−δ . The second feature represents a new mixed ab-plane/c-axis excitation. The frequency of this resonance may be changed in a controllable way by rotating the polarization of the incident radiation.Among the cuprate superconductors, Nd 2−x Ce x CuO 4 (NCCO) has attracted considerable interest because it can be considered as electron-doped compound [1], which reveals the (T ′ ) tetragonal structure and is extremely two-dimensional [1,2]. Earlier in-plane microwave experiments on NCCO [3][4][5] appeared to be consistent with the conventional s-wave BCS predictions. However, recent data including flux quantization [6] and penetration depth at microwaves [7] and at radiowaves [8] provided strong experimental evidence of d-wave symmetry of the pairing state.In contrast to a number of ab-plane experiments, there exists only few information concerning the c-axis properties of NCCO due to small dimensions of the samples along the c-axis. Most experiments on c-axis dynamics [9,10] were carried out using ceramic NCCO samples. Alternatively, the method of grazing-incidence reflection is known to be powerful in extracting the c-axis properties of strongly anisotropic superconductors [11]. The experiments using instead of the grazing reflection a tilted sample [12] and the normal-incidence geometry may be considered as modification of this method.In this letter we present the results of submillimeterwave (3 cm −1 < ν < 40 cm −1 ) experiments on tilted Nd 1.85 Ce 0.15 CuO 4−δ films at low temperatures. The spectra reveal two new features below the superconducting transition, which could be identified as: i) plasma resonance along the c-axis and ii) mixed ab-plane/c-axis excitation. Using the measurements at different polarizations of the incident radiation it was possible to separate the effective conductivity at a tilted angle into components within the ab-plane and along the c-axis.The experiments were carried out on different Nd 1.85 Ce 0.15 CuO 4−δ films yielding similar results. For simplicity, the results from only one film are presented. The films were prepared using a two-beam-laser deposition on yttrium stabilized ZrO 2 substrates [13]. X-ray analysis revealed the c-axis orientation of the films. The substrate of the presented film was tilted from (001) plane by an angle α = 0.8 o ± 0.4 o . Therefore, the film was also tilted by the same angle from the ideal c-axis orientation. The ac-susceptibility measurements revealed a narrow superconducting transition (∆T [10% − 90%] = 0.9 K) with the onset temperature of 20.1 K. The film thickness, estimated from the deposition time, was d = 170 nm.The transmission experiments in the frequency range 6 cm −1 < ν < 40 cm −...

show abstract

Experimental test of the interlayer pairing models for high-Tcsuperconductivity using grazing-incidence infrared reflectometry

Abstract: Experimental test of the interlayer pairing models for high-Tc superconductors using grazing-incidence infrared reflectometry Schuetzmann, J.; Somal, H.S.; Tsvetkov, A.A.; van der Marel, D.; Koops, G.E.J.; Koleshnikov, N.; Ren, Z.F.; Wang, J.H.; Bruck, E.H.; Menovsky, A.A.

Cited by 50 publications

References 14 publications

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

c-Axis Optical Sum Rule and a Possible New Collective Mode inLa2−xS
Kuzmenko
¹
,
Tombros
²
,
Molegraaf
³

et al. 2003
Phys. Rev. Lett.
Self Cite
27
3
20
0
View full text Add to dashboard Cite

Submillimeter spectroscopy of tilted Nd1.85Ce0.15CuO4−δ films: Observation of a mixed ac-plane excitation

Contact Info

Product

Resources

About

Experimental test of the interlayer pairing models for high-Tcsuperconductivity using grazing-incidence infrared reflectometry

Abstract: Experimental test of the interlayer pairing models for high-Tc superconductors using grazing-incidence infrared reflectometry Schuetzmann, J.; Somal, H.S.; Tsvetkov, A.A.; van der Marel, D.; Koops, G.E.J.; Koleshnikov, N.; Ren, Z.F.; Wang, J.H.; Bruck, E.H.; Menovsky, A.A.

Cited by 50 publications

References 14 publications

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δIdeta1, Takashima2, Hashimoto3 et al. 2010Phys. Rev. Lett.699500View full textAdd to dashboardCite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δIdeta1, Takashima2, Hashimoto3 et al. 2010Phys. Rev. Lett.699500View full textAdd to dashboardCite

c-Axis Optical Sum Rule and a Possible New Collective Mode inLa2−xSKuzmenko1, Tombros2, Molegraaf3 et al. 2003Phys. Rev. Lett.Self Cite273200View full textAdd to dashboardCite

Submillimeter spectroscopy of tilted Nd1.85Ce0.15CuO4−δ films: Observation of a mixed ac-plane excitation

Contact Info

Product

Resources

About

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

Enhanced Superconducting Gaps in the Trilayer High-TemperatureBi2Sr2Ca2Cu3O10+δ
Ideta
¹
,
Takashima
²
,
Hashimoto
³

et al. 2010
Phys. Rev. Lett.
69
9
50
0
View full text Add to dashboard Cite

c-Axis Optical Sum Rule and a Possible New Collective Mode inLa2−xS
Kuzmenko
¹
,
Tombros
²
,
Molegraaf
³

et al. 2003
Phys. Rev. Lett.
Self Cite
27
3
20
0
View full text Add to dashboard Cite